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ANSYS Workbench Fatigue Module

Ansys Fatigue Module 1


This tips & tricks article illustrates how to take into account a non-zero mean stress in an ANSYS Workbench fatigue analysis.

 Download: ANSYS Workbench Fatigue Model (*.wbpz)


Combine static and varying load in WB Fatigue Module

ANSYS WB Fatigue Module is able to solve Constant Amplitude, Non-Proportional Loading

First here are some definitions:

 Ansys Fatigue Module 2


Non zero mean stress loading

To create this fatigue solution we have to obtain the stress result for Smaximum and Sminimum

Ansys Fatigue Module 3

Alternating bending stress   R < -1

 For instance we have an alternating bending stress with a mean compression stress.


Ansys Fatigue Module 4


Smaximum and Sminimum

In ANSYS Workbench we have to combine the static and alternating stress in 2 static structural solutions that will give us the Smaximum and Sminimum.

Ansys Fatigue Module 5

Ansys Fatigue Module 6



Solution Combination

 Ansys Fatigue Module 7

Once the maximum and minimum result is obtained we will be able to combine them into a Solution combination to allow the fatigue module calculate it.


Ansys Fatigue Module 8



 ANSYS Workbench Fatigue Module Result

 Ansys Fatigue Module 9


In the Gerber mean stress correction theory, the compression mean stress has a penalizing impact on the fatigue life of the part.